package com.q.course.bean.common;

import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

import org.springframework.beans.BeansException;
import org.springframework.beans.FatalBeanException;
import org.springframework.util.Assert;

public abstract class BeanUtils extends org.springframework.beans.BeanUtils {   
	  
  public static void copyProperties(Object source, Object target) throws BeansException {   
    Assert.notNull(source, "Source must not be null");   
    Assert.notNull(target, "Target must not be null");   
    Class<?> actualEditable = target.getClass();   
    PropertyDescriptor[] targetPds = getPropertyDescriptors(actualEditable);   
    for (PropertyDescriptor targetPd : targetPds) {   
      if (targetPd.getWriteMethod() != null) {   
        PropertyDescriptor sourcePd = getPropertyDescriptor(source.getClass(), targetPd.getName());   
       if (sourcePd != null && sourcePd.getReadMethod() != null) {   
          try {   
            Method readMethod = sourcePd.getReadMethod();   
            if (!Modifier.isPublic(readMethod.getDeclaringClass().getModifiers())) {   
              readMethod.setAccessible(true);   
            }   
            Object value = readMethod.invoke(source);   
            // 这里判断以下value是否为空 当然这里也能进行一些特殊要求的处理 例如绑定时格式转换等等   
            if (value != null) {   
             Method writeMethod = targetPd.getWriteMethod();   
              if (!Modifier.isPublic(writeMethod.getDeclaringClass().getModifiers())) {   
                writeMethod.setAccessible(true);   
              }   
              writeMethod.invoke(target, value);   
            }   
          } catch (Throwable ex) {   
            throw new FatalBeanException("Could not copy properties from source to target", ex);   
          }   
        }   
      }   
    }   
  }   
}  
